Let newArray = array.slice(0, 3) // Return value is also an arrayįinally, I assign the sliced Array to the newArray variable. That’s why I call the second parameter “until”. array -> 1 // includedĪrray -> 'hello world' // not included The slice( ) method doesn’t include the last given element. When I want to slice the first three elements, I must give the until parameter as 3. Since the first element of an array is always indexed at 0, I start slicing “from”0.

Until: Slice the array until another element indexįor example, I want to slice the first three elements from the array above.From: Slice the array starting from an element index.The slice( ) method copies a given part of an array and returns that copied part as a new array. An array with different data types: string, numbers, and a boolean. Now let’s declare another array with different data types. Let arrayDefinition = // Array declaration in JS You can see below how to declare an array in JavaScript: Then we use some JS methods like slice () & splice (). Sometimes we need to do operations on those arrays. But the difference is that JS arrays can contain different type of data at once. Like in other programming languages, we use arrays to store multiple data in JS. If you prefer, you can also watch the video version below:įirstly, you need to understand how JavaScript arrays work.

You can find a summary of each method in the end. I advise students and junior developers to read this article carefully because these three methods can also be asked in JOB INTERVIEWS. Perhaps because their naming is so similar they are often confused, even among experienced developers. I would like to explain three of them in this article: the slice(), splice() and split()methods.

JavaScript built-in methods help us a lot while programming, once we understand them correctly.

Node js array slice